Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Nurikabe Easy | 5x5 Nurikabe Hard | 7x7 Nurikabe Easy | 7x7 Nurikabe Hard | 10x10 Nurikabe Easy | 10x10 Nurikabe Hard | 12x12 Nurikabe Easy | 12x12 Nurikabe Hard | 15x15 Nurikabe Easy | 15x15 Nurikabe Hard | 20x20 Nurikabe Easy

This Month
1. bearn
125
00:22.64
2. vowels
161
00:34.87
3. A2Ragnell
5
00:39.34
4. tiramasu 01:09.64
5. HackMan
24
01:43.86
6. nabifan
57
01:44.51
7. s56squared 01:49.40
8. Number7
3
01:49.79
9. 8bit
26
02:08.77
10. TashiroMiraki
136
02:48.28
11. Harriet
27
03:12.90
12. JDS42 04:20.48
13. sewojtaszek1 04:28.16
14. toaster611
29
04:32.14
15. topaz
25
04:38.65
16. PsychoClaw
4
06:43.60
17.--- empty -----:--
18.--- empty -----:--
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This Week
1. tiramasu 01:09.64
2. s56squared 01:53.22
3. Number7
3
02:01.38
4. TashiroMiraki
136
02:48.28
5. sewojtaszek1 04:28.16
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Today
1. s56squared 01:53.22
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MO3
1. bearn
125
00:23.85
2. sfumato
159
00:26.65
3. Douglas Shamlin Jr.
422
00:32.25
4. mediteran13
54
00:35.13
5. vowels
161
00:41.52
6. EinsteinsBarber
88
00:46.59
7. numbrr
126
00:51.94
8. qqwref
187
01:00.45
9. arcer
86
01:06.92
10. Tristal
47
01:07.52
AO5
1. bearn
125
00:26.41
2. sfumato
159
00:28.12
3. Douglas Shamlin Jr.
422
00:31.44
4. vowels
161
00:41.52
5. mediteran13
54
00:42.16
6. EinsteinsBarber
88
00:48.52
7. numbrr
126
00:52.71
8. Tristal
47
01:08.63
9. Fastfaxer
117
01:10.97
10. qqwref
187
01:11.90
AO12
1. bearn
125
00:28.78
2. sfumato
159
00:33.67
3. Douglas Shamlin Jr.
422
00:36.08
4. vowels
161
00:53.58
5. EinsteinsBarber
88
00:56.39
6. numbrr
126
01:09.67
7. qqwref
187
01:13.03
8. Tristal
47
01:15.54
9. NoahR
180
01:18.75
10. Fastfaxer
117
01:19.37
Robots / programmatic solversinfo  
1.4s4f400:00.373
2.Charlie Li
60
00:00.485
3.nbjohnson00:00.735

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2022-10-03 15:32:24

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